Using the platform installer, CDK installation failed, progress shown as 99%. At this point the installer was hung.
Note:

• CDK install progress said Failed, with progress stuck at 99%.
• There is no way to cancel out of the install.
• There was no pop-up about error messages.
• No indication of where to look for error messages/logs etc.was provided.
• CDK was previously installed manually. However, the installer window didn't say a previous CDK installation was detected, but the log does show it deleted the previous cdkv2 box.

From the log it looks like the box add command failed. When originally reported it might have been due to disk space, but it's not clear/obvious from the log. As of DevSuite 1.1.0 GA, the problems still exists if the vagrant box add command fails. Note: I've verified this isn't related to disk space and is a Vagrant problem.

Note: after killing the installer and trying the `vagrant box add` command copied from the log file manually in Cygwin bash the box add command succeeded. The test system had 5-15 GB of free space between the installation started.

Full log attached, excerpt here.

Tue, 26 Apr 2016 18:05:38 GMT-INFO: cdk - Move C:\Users\rct\AppData\Local\Temp\7zSC53C.tmp\rhel-vagrant-virtualbox.box to c:\sw\rhjbds\cdk\boxes\rhel-vagrant-virtualbox.box
Tue, 26 Apr 2016 18:05:43 GMT-INFO: cdk - Move C:\Users\rct\AppData\Local\Temp\7zSC53C.tmp\rhel-vagrant-virtualbox.box to c:\sw\rhjbds\cdk\boxes\rhel-vagrant-virtualbox.box SUCCESS
Tue, 26 Apr 2016 18:05:43 GMT-INFO: cdk - Move C:\Users\rct\AppData\Local\Temp\7zSC53C.tmp\pscp.exe to c:\sw\rhjbds\cdk\bin\pscp.exe
Tue, 26 Apr 2016 18:05:43 GMT-INFO: cdk - Move C:\Users\rct\AppData\Local\Temp\7zSC53C.tmp\pscp.exe to c:\sw\rhjbds\cdk\bin\pscp.exe SUCCESS
Tue, 26 Apr 2016 18:05:43 GMT-INFO: cdk - Write C:\Users\rct\AppData\Local\Temp\set-pscp-path.ps1
Tue, 26 Apr 2016 18:05:43 GMT-INFO: cdk - Write C:\Users\rct\AppData\Local\Temp\set-pscp-path.ps1 SUCCESS
Tue, 26 Apr 2016 18:05:43 GMT-INFO: cdk - Write c:\sw\rhjbds\cdk\components\rhel\rhel-ose\.cdk
Tue, 26 Apr 2016 18:05:43 GMT-INFO: cdk - Write c:\sw\rhjbds\cdk\components\rhel\rhel-ose\.cdk SUCCESS
Tue, 26 Apr 2016 18:05:43 GMT-INFO: cdk - Execute powershell -ExecutionPolicy,ByPass,-File,C:\Users\rct\AppData\Local\Temp\set-pscp-path.ps1
Tue, 26 Apr 2016 18:05:44 GMT-INFO: cdk - Execute powershell -ExecutionPolicy,ByPass,-File,C:\Users\rct\AppData\Local\Temp\set-pscp-path.ps1 SUCCESS
Tue, 26 Apr 2016 18:05:44 GMT-INFO: cdk - postVagrantSetup called
Tue, 26 Apr 2016 18:05:44 GMT-INFO: cdk - Execute command vagrant plugin install "c:\sw\rhjbds\cdk\plugins\vagrant-registration-1.2.1.gem"
Tue, 26 Apr 2016 18:05:44 GMT-INFO: cdk - Execute options {
"env":

{ "path": "C:\\HashiCorp\\Vagrant\\bin;C:\\Program Files\\Oracle\\VirtualBox\\;" }

}
Tue, 26 Apr 2016 18:05:55 GMT-INFO: cdk - Installing the 'c:\sw\rhjbds\cdk\plugins\vagrant-registration-1.2.1.gem' plugin. This can take a few minutes...
Installed the plugin 'vagrant-registration (1.2.1)'!

Tue, 26 Apr 2016 18:05:55 GMT-INFO: cdk - Execute vagrant plugin install "c:\sw\rhjbds\cdk\plugins\vagrant-registration-1.2.1.gem" SUCCESS
Tue, 26 Apr 2016 18:05:55 GMT-INFO: cdk - Execute command vagrant box remove cdkv2 -f
Tue, 26 Apr 2016 18:05:55 GMT-INFO: cdk - Execute options {
"env":

{ "path": "C:\\HashiCorp\\Vagrant\\bin;C:\\Program Files\\Oracle\\VirtualBox\\;" }

}
Tue, 26 Apr 2016 18:06:02 GMT-INFO: cdk - Removing box 'cdkv2' (v0) with provider 'virtualbox'...

Tue, 26 Apr 2016 18:06:02 GMT-INFO: cdk - Execute vagrant box remove cdkv2 -f SUCCESS
Tue, 26 Apr 2016 18:06:02 GMT-INFO: cdk - Execute command vagrant box add --name cdkv2 "c:\sw\rhjbds\cdk\boxes\rhel-vagrant-virtualbox.box"
Tue, 26 Apr 2016 18:06:02 GMT-INFO: cdk - Execute options {
"env":

{ "path": "C:\\HashiCorp\\Vagrant\\bin;C:\\Program Files\\Oracle\\VirtualBox\\;" }

}
Tue, 26 Apr 2016 18:06:10 GMT-ERROR: cdk - Error: Command failed: vagrant box add --name cdkv2 "c:\sw\rhjbds\cdk\boxes\rhel-vagrant-virtualbox.box"
The box failed to unpackage properly. Please verify that the box
file you're trying to add is not corrupted and try again. The
output from attempting to unpackage (if any):

x box.ovf
x Vagrantfile
x vagrant-virtualbox-box.vmdk: Write failed
x metadata.json
bsdtar.EXE: Error exit delayed from previous errors.

Tue, 26 Apr 2016 18:06:10 GMT-ERROR: cdk - The box failed to unpackage properly. Please verify that the box
file you're trying to add is not corrupted and try again. The
output from attempting to unpackage (if any):

x box.ovf
x Vagrantfile
x vagrant-virtualbox-box.vmdk: Write failed
x metadata.json
bsdtar.EXE: Error exit delayed from previous errors.

Tue, 26 Apr 2016 18:06:10 GMT-ERROR: cdk failed to install: Error: Command failed: vagrant box add --name cdkv2 "c:\sw\rhjbds\cdk\boxes\rhel-vagrant-virtualbox.box"
The box failed to unpackage properly. Please verify that the box
file you're trying to add is not corrupted and try again. The
output from attempting to unpackage (if any):

x box.ovf
x Vagrantfile
x vagrant-virtualbox-box.vmdk: Write failed
x metadata.json
bsdtar.EXE: Error exit delayed from previous errors.